The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 2005
Filed:
Dec. 19, 2003
Applicants:
Peter D. Phelps, Schenectady, NY (US);
Timothy A. Thompson, Dresden, DE;
Inventors:
Peter D. Phelps, Schenectady, NY (US);
Timothy A. Thompson, Dresden, DE;
Assignee:
Cyclics Corporation, Schenectady, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G064/00 ;
U.S. Cl.
CPC ...
Abstract
Acid impurities, such as carboxylic acid-terminated polymers, are removed from macrocyclic oligoesters with ion exchange resins, resulting in macrocyclic oligoesters that are substantially free of acid impurities. The ion exchange resins can be regenerated anew and reused by washing the resins with various wash solutions. Macrocyclic oligoesters substantially free of acid impurities polymerize to much higher molecular weight polyesters than macrocyclic oligoesters containing acid impurities.